#include <stdio.h>
int main()
{
	// a ^ a = 0
	// 0 ^ a = a
	//1.
	int a = 3;
	int b = 5;
	a = a ^ b;
	b = a ^ b;
	a = a ^ b;
	//2.
	a = a + b;
	b = a - b;
	a = a - b;

	return 0;
}